SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3741171765364d341ab757f87712ae29d8d4a3b4458df8955ad191fbf57056a' 
  AND token = 'PyzdXNO96CywCnq0AH6vPVNj/0WXVUuJjlYEESsiuoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}